Cyaniding apparatus.



F. E. CARMAN.

CYANIDING APPARATUS.

APPLICATION FILED OCT. 22, 1912. RENEWED DEC. 22, 1914.

1,146,783. Patented July 20, 1915.

P 2 SHEETSSHEET l.

WITNESSES INVENTOR ATTORNEYS COLUMBIA PLANOYJRAPH C0.,WASHINGTON, D c.

F. E. CARMAN.

CYANIDING APPARATUS. APPLICATION FILED oc'T. 22. 1912. RENEWED DEC. 22, 1914. 1,146,783.

Patented July 20, 1915.

2 SHEETSSHEET 2.

WITNESSES COLUMBIA PLANOGRAPH co.. WASHINGTON, D. c.

* rrnn ear QFFTQQ FREDERICK E. CARMAN, 0F JAMAICA, 'NEW YORK, ASSIGNOR TO MIRIAM E. CARMAN',

OF BABYLON, NEW YORK.

CYANIDING APPARATUS.

Specification of Letters Patent.

Patented July 20, 1915.

Application filed. October 22, 1912, Serial No. 727,093. Renewed December 22, 1914. Serial No. 878,610.

To all whom it may concern:

Be it known that I, FREDERICK E. CARMAN, a citizen of the United States, residing at No, 99 rlerriman avenue, Jamaica, Queens county, State of New York, have invented certain new and useful Improvements in Cyaniding Apparatus; and I do hereby declare the following to'be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present inventionrelates to tanks for the treatment of ores by the cyaniding process wherein the ore in the form of a pulp is maintained in suspension within the cyaniding liquid and is brought into contact with the air in a thin film in order that it may be subjected to the oxidizingactionof the air, and wherein the liquid is alternately heated and cooled to produce the favorable results arising from this method of treatment.

The invention consists in an arrangement of the container bywhich the pulp is maintained in suspension and every part of the tank charge is brought intocontact with the air in a thin film through a system of circulation which requiresthe minimum lift of the material. and therefore the minimumexpenditure of power.

' The invention alsof resides in the various features of the organization and structure hereinafter particularly described and set forth in the appended claims.

An embodiment of the apparatus forming the subject matter of the invention is illustrated, in the accompanying drawings, in whichi Figure 1 is a section in elevation through the center of the apparatus; Fig. 2, a plan; and Fig. 3 a detail in section offthelower portion of the container and the discharge valve mechanism. 7 I

In apparatus of this character it has been the usual practice, where a current circulation has been employed to maintain the pulp in such a condition that the oreis kept in suspension, to create anupflow at the center of the tank whichraises the central portion of the surface of the pulp and causes it to flow outward by gravity and then downwardly at the outward portions of'the tank. I find that in order to maintain a given flow of liquid over the top of a circular partition within a tank that it isnecessary, when the flow is from within the partition outwardly that the difference in level which must be maintained between the liquid within the partition and that without is greater than when the flow is from without the partition toward the center. It appears that it is easier to maintain the flow from the periphery toward the center, and I have utilized this phenomenon effectively in the illustrated embodiment of my invention.

Referring to the drawings; a tank A having the general form of an inverted frustum of a cone is mounted upon and in a framework B, two members of which framework provide a bridge over the center of the tank. A partition D having the general form of an inverted frustum of a flatter cone is mountedwithin the tank A and is supported by braces E, and this partition divides the interior of the tank A into an outer channel F, and an inner channel G which communicate at the upper'peripheral edge of the partition D, this edge of the partition being spaced at H from the wall of the tank A, and at the lower central part of the partition where a circular opening I is provided. A cylindrical upward extension K is provided upon the upper edge of the tank A and a cylindrical downward extension L is provided upon the lower edge of the partition D surrounding the central opening I. A hollow shaft .M is mounted in a bearing 0 on the bridge C and a second bearing a on an upstanding frame N and the lower free end of this shaft extends .downwardly in the axis of the tank. and is provided upon its lower end with a screw pump or propeller O which is designed to rotate within the cylindrical extension L of the partition D. .A pulley m fast on the shaft M carries a'belt m driven from a second pulley m on a driving shaft 772' to which power is applied from any suitable source. While thisarrangement for rotating the shaft M is a simple one, any suitable drive may be employed. The upper bearing n for the shaft M isprovided with a stufiing box and serves to conduct air or water from a pipe P to the interior of the hollow shaft M. The pipe P is provided with a valve 70 for the admission offluid to theshaft M from suitv and issuing at the periphery of the blade at its lowermost point which rotates close to lower level leaving a space through which liquid may run ofi the apron Q. and follow the lip g and this second apron It extends inwardly at substantially the same downward slant as that which the apron Q, is given. A pipe S issues into the chamber d and is provided with a valve 3 for the admission and exhaust of air or water under pressure from a suitable source to flush or clean the chamber 0? of any material which may accumulate within it. A heating coil T, preferably of the'conical form shown, is supported on the partition D around the shaft M and over the circular opening I and is provided with a valve 23 for the control of a heating fluid such as steam from a boiler or other suitable source. A discharge opening in the bottom of the tank A is closed by a closure U from the outside and this closure is operated by a lever-u which is drawn up or let down by a screw u operated by a hand wheel 1/. A trough V beneath the discharge opening conducts the discharged material from beneath the tank.

The operation of the apparatus is as follows The containerAis filled with pulp up to the level of the inner apron or thereabout and the driving mechanism is set in motion. The screw pump or propeller 0 creates a circulation of the pulp downwardly against the bottom of the container A effectually preventing settling upon the bottom and upwardly through the outer upflow channel, thence over the outer apron Q at the inner edge of which a portion of the liquid flows under and along the lip 9 creating a current which effectually prevents settling of the solid matter on the slanting wall of thepartition D, and the remainder of the liquid flows over the innerapron R in a thinfilm on to the surface of the pulp contained in the downfiow channel within the partition D. As the pulp flows outwardly in the outer upfiow channel, its velocity is maintained by the narrowing of this channel as its diameter increases, by which maintenance of the velocity the settling out of the solids isprevented. As the pulp flows in a thin film over the aprons, it is thoroughly subjected to the oxidizing and cooling action of the air, and as it passes down the downflow channel, it is heated by coming in contact with the heating coils T.

It'will be noted that the apparatus as constructed'c'a'us'es an alternate heating" by contact with the air of every particle of the pulp asit is circulated. This is of great value in the process of cyaniding ores. During the circulation of the pulp, compressed air may be admitted to the pipe P by opening the valve 39, and this air passing down.

the hollow shaft M and through the duct 0 in the propeller O issues just at the bottom edge of the partition D, although a portion of it finds it way upward through the downflow v passage, and the. greater part intermingles'with the stream of pulp flowing upwardly in the upflow passage. This intermingling of the air with the current of pulp materially aids the action of the cyanid. The flow of air may be regulated andif desired water may be forced through the hollow shaft M. The flow of the heating agent, whether it be hot water or steam, through the heating coil may be regulated as desired. When the tank is to be emptied, the hand wheel u may be turned to screw down the lever u and thus remove the closure from the orifice in the bottom of the container and allow the pulp to flow out through the trough V. The tank may be effectually cleansed by opening the valve t and allowing air, steam or water to flow into the annular chamberd and thence down through the upflow channel to the discharge orifice.

What I claim is:

1. In a cyaniding tank, a receptacle having the form of an inverted frustum of a cone, a partition having the form of an inverted frustum of a flatter cone and secured within said receptacle to afford outer and inner compartments communicating at their upper peripheral portions and at their lower central portions, and means for creating a,

current of liquid downwardly within said inner compartment and upwardly within said outer compartment; substantially as described.

2. In a cyaniding tank, a receptacle having the form of an inverted frustum of a cone, a partition having the form of an inverted frustu-m of a flatter cone and secured within said receptacle to afford acirculating passageway which comprises an outer channel which flares upwardly from the bottom of the receptacle and issues through an annular narrow aperture intoan inner channel which converges downwardly and issues into said outer channel adjacent to bottom of said receptacle, an apron extending inwardly from the upper annular aperture from said inner channel and inclined downwardly toward the center of the receptacle,

and means for creating a. circulation of a liquid contained within thereceptacle downwardly through saidinner channel and upwardly through said outer channel; substantially as described.

3. In a cyaniding tank, a container, 2. partition in said container dividing the same into an outer upflow channel and an inner downfiow channel, an apron extended inwardly from the upper annular mouth of said upfiow channel and inclined downwardly at a slight angle toward the center, and means for creating a current of liquid contained within said container upwardly through said outer channel across said apron and downwardly through said inner channel against the bottom of the receptacle; substantially as described.

4:. In a cyaniding tank, a container, a partition within said container dividing the same into an outer upfiow channel and an inner downflow channel, an apron extending inwardly and slightly downwardly from the upper edge of said partition, a downwardly and backwardly extending lip upon the inner edge of said apron, and means for creating a current of liquid contained Within said container, upwardly through said outer upfiow channel across said apron and downwardly through said inner downflow channel against the bottom of the recep- Copies of this patent may be obtained for tacle; substantially as and for the purpose set forth.

5. In a cyaniding tank, a container, a partition within said container dividing the a downwardly and backwardly turned lip upon the inner edge of said apron, a second apron extending inwardly and slightly downwardly from said first apron and spaced from the inner edge thereof, and propelling means for creating a current of contained liquid upwardly through said upflow channel over said aprons and downwardly through said downflow channel; substantially as described.

In testimony whereof I aflix my signature, in presence of two witnesses.

FREDERICK E. CARMAN.

Witnesses M. A. BILL, MARCUS G. HOPKINS.

five cents each, by addressing the Commissioner of Patents.- Washington, D. C. 

